From 6077c2d706097c00d8f2fed57d3f3c45cd228ee8 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Fri, 7 Apr 2017 11:16:54 -0700 Subject: dm rq: Avoid that request processing stalls sporadically While running the srp-test software I noticed that request processing stalls sporadically at the beginning of a test, namely when mkfs is run against a dm-mpath device. Every time when that happened the following command was sufficient to resume request processing: echo run >/sys/kernel/debug/block/dm-0/state This patch avoids that such request processing stalls occur. The test I ran is as follows: while srp-test/run_tests -d -r 30 -t 02-mq; do :; done Signed-off-by: Bart Van Assche Cc: Mike Snitzer Cc: dm-devel@redhat.com Signed-off-by: Jens Axboe --- drivers/md/dm-rq.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index 28955b94d2b2..0b081d170087 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -755,6 +755,7 @@ static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, /* Undo dm_start_request() before requeuing */ rq_end_stats(md, rq); rq_completed(md, rq_data_dir(rq), false); + blk_mq_delay_run_hw_queue(hctx, 100/*ms*/); return BLK_MQ_RQ_QUEUE_BUSY; } -- cgit v1.2.3